<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    .box1{
      float: left;
      width: 200px;
      height: 200px;
      background-color: pink;
    }
    .box2{
      width: 300px;
      height: 300px;
      background-color: rgba(0,153,255);
    }
  </style>
</head>
<body>
<div  class="box1">浮动的盒子</div>
<div class="box2">标准流的盒子</div>

</body>
</html>